......DE....FRGB..................................R0607806EUROPEAN PATENT APPLICATIONA319961016EP94100128.119940105enenen5591/9319930118JP19961016199642199407271994305 5H 01M 4/38 A 5H 01M 10/24 BdeAlkalische Speicherbatterie und Verfahren zur Herstellung derselbenenAlkaline storage battery and method for producing the samefrPile de stockage alcaline et méthode pour sa fabricationNONEMATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.00216883E0609-02CM1006, Oaza KadomaKadoma-shi, Osaka-fu, 571JPOkawa, Takashi9-21-B-204, Honkugenuma-4-chomeFujisawa-shiJPEnokido, Masashi3683-10, AkabaneChigasaki-shiJPTsuda, Shingo607-2, KarasawaFujisawa-shiJPAkutsu, Norikatsu4-4, Matsubara-2-chome, Setagaya-kuTokyoJPPatentanwälte Leinweber & Zimmermann00100261Rosental 7/II Aufg.80331 MünchenDEDEFRGB19961016199642

The alkaline storage battery made using a hydrogen-storing alloy for the negative electrode has suffered from the problems that the negative electrode is oxidized with oxygen gas generated from the positive electrode during overdischarge to cause increase of internal resistance and deterioration of charging and discharging cycle characteristics. According to the present invention, the above problems are solved by incorporating at least one of yttrium and yttrium compounds into the negative electrode comprising the hydrogen-storing alloy.